In Adsense reports the Total page views is less than individual channels. Eg: example.com is more than Total page views. How is this possible ?
that is because you have the same channel displayed twice in a page. for example, if you create a channel called 160x600_image_ad, and you put 2 banners of this kind on a page, the impressions for this channel will be counted twice, hence the total impressions is counted once. Hope you got the idea....